Results 11 to 20 of about 375,626 (299)

Hard sets are hard to find

open access: yesProceedings. Thirteenth Annual IEEE Conference on Computational Complexity (Formerly: Structure in Complexity Theory Conference) (Cat. No.98CB36247), 1999
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Buhrman, H.M., van Melkebeek, D.
openaire   +7 more sources

Crystal Indentation Hardness

open access: yesCrystals, 2017
There is expanded interest in the long-standing subject of the hardness properties of materials. A major part of such interest is due to the advent of nanoindentation hardness testing systems which have made available orders of magnitude increases in ...
Ronald W. Armstrong   +2 more
doaj   +1 more source

Comparison of the effects of MoSi2 and CrSi2 on sintering and properties of titanium diboride (TiB2) [PDF]

open access: yesProcessing and Application of Ceramics, 2023
Titanium diboride (TiB2) is a typical material classified as structural ceramics. However, sintering of TiB2 ceramics is difficult mainly because of a significant fraction of covalent bonds in the structure. In order to obtain dense TiB2 ceramics various
Gubernat Agnieszka   +6 more
doaj   +1 more source

A new method for hardness determination from depth sensing indentation tests [PDF]

open access: yes, 1996
A new semiempirical formula is developed for the hardness determination of the materials from depth sensing indentation tests. The indentation works measured both during loading and unloading periods are used in the evaluation.
Juhász, A.   +2 more
core   +1 more source

Modelling Timbral Hardness

open access: yesApplied Sciences, 2019
Hardness is the most commonly searched timbral attribute within freesound.org, a commonly used online sound effect repository. A perceptual model of hardness was developed to enable the automatic generation of metadata to facilitate hardness-based ...
Andy Pearce, Tim Brookes, Russell Mason
doaj   +1 more source

Approximation hardness of dominating set problems in bounded degree graphs [PDF]

open access: yes, 2008
We study approximation hardness of the Minimum Dominating Set problem and its variants in undirected and directed graphs. Using a similar result obtained by Trevisan for Minimum Set Cover we prove the first explicit approximation lower bounds for various
Chlebikova, Janka   +3 more
core   +1 more source

Soft-Tissue-Mimicking Using Hydrogels for the Development of Phantoms

open access: yesGels, 2022
With the currently available materials and technologies it is difficult to mimic the mechanical properties of soft living tissues. Additionally, another significant problem is the lack of information about the mechanical properties of these tissues ...
Aitor Tejo-Otero   +6 more
doaj   +1 more source

INVESTIGATION OF PROPERTIES OF CURRENT COLLECTOR ELEMENTS AND THEIR EFFECT ON THE PERFORMANCE OF TRIBOSYSTEM «CONTACT WIRE - CURRENT COLLECTOR ELEMENT»

open access: yesNauka ta progres transportu, 2015
Purpose. The paper is devoted to the detailed analysis of interrelations at the contact point of friction pair «contact wire – current collector insert».
Yu. L. Bolshakov, A. V. Antonov
doaj   +1 more source

Utilizing Hydrothermal Processing to Align Structure and In Vitro Digestion Kinetics between Three Different Pulse Types

open access: yesFoods, 2022
Processing results in the transformation of pulses’ structural architecture. Consequently, digestion is anticipated to emerge from the combined effect of intrinsic (matrix-dependent) and extrinsic (processed-induced) factors.
Katharina Pälchen   +5 more
doaj   +1 more source

What is indentation hardness? [PDF]

open access: yes, 2000
Using dimensional analysis and finite element calculations, we derive simple scaling relationships for loading and unloading curve, contact depth, and hardness.
郑哲敏   +4 more
core   +1 more source

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